I think they now have lifetime warranties, but they should last quite a while either way. As far as I know, cleaning it also includes oiling it, the kit was about 9 bucks last time I checked... maybe things have changed and none of this applies, but just thought I'd mention it. I think there is a difference between their filters too, one is a kit, and another is just a regular air filter.If you've already purchased it, then just continue using it... make sure you clean it out on a regular basis though, otherwise it defeats the purpose!